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Duplex Stainless Steel Sheet
Product Name: Duplex Stainless Steel Sheet / Plate
Keywords: Duplex stainless steel sheet, duplex plate, 2205 stainless sheet, 2507 stainless plate, S32205 sheet, S31803 duplex plate
Standards: ASTM A240 / A480, EN 10088-2, JIS G4304, GB/T 4237
Surface Finish: 2B, BA, No.1, No.4, Hairline, HL, SB, Mirror 8K
Available Forms: Sheet, Plate, Coil, Strip, Precision Cut Sheet
Description
Duplex Stainless Steel Sheet, also known as Duplex SS Plate, Duplex Stainless Steel Plate, and Duplex Alloy Sheet, is a high-strength, corrosion-resistant stainless steel widely used in marine engineering, pressure vessels, chemical processing equipment, and offshore structures. Manufactured according to international standards such as ASTM A240, EN 10088, and GB/T 4237, our factory provides duplex grades including 2205 (UNS S32205/S31803), 2507 (UNS S32750), 2101, 2304, and customized duplex alloys.
We offer slit coils, cut-to-size plates, surface finishing options, and third-party inspection (SGS / TUV / BV) to ensure stable quality for global B2B buyers.
Duplex stainless steel sheet, duplex plate, 2205 stainless sheet, 2507 stainless plate, S32205 sheet, S31803 duplex plate
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High Quality
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Advanced Equipment
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Professional Team
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Custom Service
Common Grades Offered
| Grade | UNS | EN | Description |
|---|---|---|---|
| 2205 | S32205 / S31803 | 1.4462 | Most widely used duplex, excellent strength & corrosion resistance |
| 2507 Super Duplex | S32750 | 1.4410 | Superior pitting & chloride resistance |
| 2304 | S32304 | 1.4362 | Lean duplex, economic version |
| 2101 | S32101 | 1.4162 | High Mn, cost-effective duplex |
| 2707 | S32707 | - | Ultra high strength super duplex |
Available Specifications
| Item | Metric Size | Imperial Size | Tolerance |
|---|---|---|---|
| Thickness | 0.5–80 mm | 0.020"–3.15" | ±0.02–0.10 mm |
| Width | 1000 / 1219 / 1250 / 1500 / 1800 / 2000 mm | 39" / 48" / 50" / 60" / 71" / 79" | ±2 mm |
| Length | 2000–12000 mm | 79"–472" | ±3 mm |
| Coil Inner Diameter | 508 / 610 mm | 20" / 24" | - |
| Plate Types | Hot Rolled / Cold Rolled | HR / CR | - |
Chemical Composition (Typical, %)
| Grade | Cr | Ni | Mo | N | Mn | C | Notes |
|---|---|---|---|---|---|---|---|
| 2101 (S32101) | 21.0 | 1.5 | - | 0.22 | 5.0 | ≤0.04 | Lean duplex; cost-effective, high Mn |
| 2304 (S32304) | 23.0 | 4.8 | - | 0.10 | 2.0 | ≤0.03 | General-purpose duplex, no Mo |
| 2205 (S32205/S31803) | 22.0 | 5.7 | 3.2 | 0.18 | 1.5 | ≤0.03 | Most widely used standard duplex |
| 2507 (S32750) | 25.0 | 7.0 | 4.0 | 0.27 | 1.0 | ≤0.03 | Super duplex; high Mo & N |
| 2707 (S32707) | 27.0 | 6.5 | 4.8 | 0.40 | 1.0 | ≤0.03 | Ultra-super duplex with extreme corrosion resistance |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 2101 | 450 | 650 | 30 | ≤290 |
| 2304 | 400 | 650 | 25 | ≤290 |
| 2205 | 450 | 620 | 25 | ≤290 |
| 2507 | 550 | 795 | 20 | ≤310 |
| 2707 | 650 | 900 | 20 | ≤330 |
Corrosion Resistance Level (Pitting, Crevice, SCC)
(PREN = Cr + 3.3Mo + 16N)
| Grade | Typical PREN | Corrosion Resistance Level | Chloride SCC Resistance |
|---|---|---|---|
| 2101 | 24–27 | ★★☆☆ | Medium |
| 2304 | 24–27 | ★★☆☆ | Medium |
| 2205 | 34–36 | ★★★★ | High |
| 2507 | 40–45 | ★★★★★ | Very High |
| 2707 | 48–50 | ★★★★★+ | Extreme |
Interpretation:
PREN < 30: Lean Duplex
PREN 32–40: Standard Duplex (2205)
PREN 40+ : Super Duplex (2507/2707)
Weldability Comparison
| Grade | Weldability | Notes |
|---|---|---|
| 2101 | Good | Low Ni reduces hot cracking sensitivity |
| 2304 | Good | No Mo → easier welding |
| 2205 | Good | Must control heat input |
| 2507 | Medium | Requires precise heat control & matching filler |
| 2707 | Medium–Low | Strict heat input control due to high alloy content |
Heat Resistance & Temperature Range
| Grade | Operating Temp | Notes |
|---|---|---|
| 2101 | -40°C to 250°C | Good general use |
| 2304 | -50°C to 300°C | Slightly better high-temperature stability |
| 2205 | -50°C to 300°C | Balanced performance |
| 2507 | -50°C to 250°C | Avoid high temp to prevent phase imbalance |
| 2707 | -50°C to 250°C | Similar to super duplex limitations |
Typical Applications Comparison
| Grade | Application Highlights |
|---|---|
| 2101 | Building structures, storage racks, containers, automotive, general fabrication |
| 2304 | Heat exchangers, tanks, water systems, desalination pre-treatment |
| 2205 | Pressure vessels, marine pipelines, chemical tanks, oil & gas |
| 2507 | Offshore platforms, seawater systems, desalination, high-pressure equipment |
| 2707 | Deep-sea equipment, extreme chloride environments, heavy-duty offshore |
Cost Comparison (Relative Index)
| Grade | Cost Level | Cost Ratio (Approx) |
|---|---|---|
| 2101 | ★ | 1.0 (lowest) |
| 2304 | ★★ | 1.3 |
| 2205 | ★★★ | 1.8 |
| 2507 | ★★★★ | 2.6 |
| 2707 | ★★★★★ | 3.2+ (highest) |
Which Grade Should You Choose?
✔ Need cost-effective strength → 2101 / 2304
✔ Need general corrosion + strength balance → 2205 (Best Overall)
✔ Need seawater + high chloride resistance → 2507
✔ Need extreme corrosion + harsh offshore → 2707 Super Duplex
Product Features
High Strength: Roughly twice the yield strength of 304/316 stainless steel.
Excellent Chloride Resistance: Prevents pitting, crevice corrosion, and stress corrosion cracking.
Outstanding Fatigue Strength: Suitable for offshore and pressure equipment.
Cost-Effective: Lower nickel content than austenitic SS reduces cost while maintaining high performance.
Weldable & Formable: Compatible with TIG, MIG, SAW, and plasma cutting.
Products Applications
Marine & Offshore Platforms
Desalination Plants
Pressure Vessels & Storage Tanks
Chemical Processing Equipment
Heat Exchangers & Evaporators
Oil & Gas Pipelines
Pulp & Paper Industry
Structural Components with High Strength Requirements
For quotations, technical support, or custom duplex stainless steel sheet solutions:
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
Inspection & Quality Assurance
Raw material traceability with MTC (EN 10204 3.1 / 3.2).
Strict dimensional inspection: thickness, width, flatness, edge condition.
PMI (Positive Material Identification) for every batch.
Mechanical testing: tensile, hardness, impact, corrosion tests (ASTM G48).
Surface inspection to ensure no scratches, dents, or laminations.
Third-party inspection available: SGS / TUV / BV / Intertek upon request.
Professional FAQ (for B2B Buyers)
1. What is the difference between Duplex 2205 and 2507?
2507 is a super duplex grade with higher Cr, Mo, and N, offering better chloride resistance and higher strength.
2. Can duplex stainless steel sheet replace 316L?
Yes, in many corrosive environments. Duplex offers higher strength and better SCC resistance, but welding condition and cost must be evaluated.
3. What is the maximum thickness you can supply?
Hot-rolled plates up to 80mm, custom orders up to 100mm depending on grade and MOQ.
4. Do you provide cut-to-size service?
Yes-laser cutting, plasma cutting, waterjet cutting, and slitting.
5. What surface finishes are most used for marine applications?
No.1 and 2B surfaces are commonly preferred.
6. How do you guarantee phase balance (austenite/ferrite)?
We perform metallographic testing to maintain 40–60% ferrite content according to standards.
7. Can duplex stainless sheet be welded using standard stainless consumables?
Recommended to use matching duplex welding rods to maintain corrosion resistance.
8. What is your MOQ?
1 ton for common grades such as 2205; other grades negotiable.
9. Can you issue an MTC with PMI results?
Yes, we provide complete material certification.
10. Do you support export packaging?
Yes-waterproof film, wooden pallets, fumigation-free crates suitable for sea freight.
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